Scalefour Forum

The overall wheelbase sets a fundamental limit. The bogie on earlier LNER Pacifics helped to guide the engine into curves, but Mr Thompson seemed to send his bogies so far enough ahead as to form a scouting party!

davebradwell wrote:I'm told there was also a drg prepared showing all the frames - all dimensioned of course - that were attached to the boiler first but this hasn't turned up.

If you mean the crinolines, then I have a copy! Think I got it from NRM.

I'm told the way to assess an A4 model is to note where the valence curve is highest and the r-t-r bodies fail here. They also make some errors on the front view. None of them has so far matched Martin's powers of observation of the smokebox doors either. Even the most exotic r-t-r have the doors f...

davebradwell wrote:The exceptions are the Thomson Pacifics - look at A2/2 and A2/3 to see a horrible link to model with the lifting arms passing through another layer of it.

So no chassis from you for the forthcoming Hornby ones then?

Noel wrote:I've got what is possibly [probably?] the same chassis under a non-corridor third acquired a few years ago, Mike, and am not particularly impressed.

Is it the Masokits version you are referring to?

One problem (which also applies to rtr wheels) is the thickness of the wheel and the position of the flange in relation to the front of the wheel. Some of these wheels have a nice spoke profile and this would be lost in turning off the front face. Except the Markits have tyres retained by an interf...

Yes, you'll need to file faces of wheels flush with tyres. They'll still be wider than scale but should fit. You can skim wheels down to the scale 1.85 thickness too if you have the facilities (front flange on tyre should be thick enough - it's usually 0.3) .... Or possibly have bespoke tyres made ...

grovenor-2685 wrote:The profile is in the Standards digest.

I'd prefer the Exactoscale profile - the scale half-inch extra clearance each side would be most welcome with outside cylinder locos.

I wonder if the Bradwell chassis would work under the later Hornby body? I've never seen a Hornby B1 come up for spares, not even from the eBay RTR dismantler who used to offer some very broken Hornby-China engines. Since mention has been made earlier in this thread of a possible Hornby equivalent ...

Andy W wrote:Powerflow flux is wonderful stuff but be careful it’s very difficult to clean off and can eat through paint.

That was the reason given by some professional painters for refusing to take on jobs assembled with the aid of this flux. This discussed back in E4um days.

Perhaps we're all waiting for the correct driving wheels?

If I understand the OP correctly, the washers were introduced to counteract the over-deep cups on the waisted bearings. Thus the axleguard verticality should not be compromised as long as the washers merely take up the slack in the cups. Without the washers, and the resultant play in the cups, the a...

Barrow Hill Roundhouse contains one of these in operational condition if you need one to get up close to.

I found them near-impossible to disassemble if you get the quartering a bit wrong, as the boss will not let go of the axle... . The original P4(Studiolith) ones have a taper fit between bush and axle, like the flywheel on a Mini or Morse drills in a lathe, the come apart very easily with a sharp ta...

I wouldn't rule out 3D printing. I've been experimenting with iMaterialise.com, and their stainless steel option. [...] One of my friends has produced connecting rods and other chassis parts for a working 1:160 scale narrow gauge locomotive through this method. Interesting! Are there any photos in ...

Bachmann B1 Conversion Additionally, the two formers must be aligned to give the correct slope on the cylinders, in this case around 1 in 50. There are witness marks on the outside of the mainframes to allow this slope to be adjusted and checked. This sort of thing makes you think the kit designer ...

I wonder if the Bradwell chassis would work under the later Hornby body? Dave was of the opinion, when he mentioned it to me, that the Hornby B1 was not quite right - he thought the running board drop ahead of the cylinders was over-scale. I've kept my eyes open for a cheap spare body to check this...

Jeremy Suter wrote:Another step forward toward the kit has arrived from Slaters who have done some lost wax casting for me in nickel silver.

Is that a service they'll perform for anyone?

Le Corbusier wrote:probably a naive question ... but aren't there any facsimiles of the original shop drawings available?

There were, at Derby RTC, but no longer accessible outside the rail industry. There are indications that (N)RM has some, which are accessible, but they aren't catalogued at the per-sheet level.

Now if the Society were friendly with a tyre supplier ...

Wonder how a Class 700 (or its contents) would cope!

Philip Hall wrote:Now that they are going to be retooled to modern standards I am relieved!

... of much moolah - if the LNER Thompsons are anything to go by!

Looks to outclass the Bachmann offering by a considerable margin.
Just when I'd acquired a 3-D printer to try to make some more convincing cabs!

Don't rivets also expand in girth within their holes as they are closed? This would put tensile hoop stresses around the hole, which is a bad idea with cast iron, as it is relatively weak in tension.

As your final drive via the bevel gears is 1:1, the torque on the cardan shaft is going to approximate to the traction torque on the driven wheelset. This is then going to react with any suspension, including bolster slack, between the vehicle body and the bogie. This may not be a major problem with...